Ilk. 2. 159 IIIc. 2. 



L. Hypoglycemia following injection of insulin into chick 

 embryos of 30 hours of incubation; relation to rum- 

 plessness. Gallus domesticus. E. ZWILLING 



L. Sulfanilamide and its micromelia-inducing effects in 

 chick embryos; enhancement of the effects by para- 

 aminobenzoic acid and antagonism of nicotinamide. 

 Gallus domesticus. E. ZWILLING 



M. Experimental production of genetic and developmental Ilia. 2a. 

 variations in genetically stable material by treatment of Illb. 2a. 

 gonads, germ cells and embryos. Mus musculus. 



M. N. RUNNER 



M. Developmental genetics of the mouse skeleton (mutants Hid. 3. 



genes and natural polymorphism of wild populations). 

 Mus musculus. H. GRUNEBERG 



M. Development and morphology of hair and skin mutants, I. 8. 



particularly the mimic hair-waving genes. Mus musculus. 

 D. S. FALCONER and A. S. FRASER 



M. Development of tail structure in normal, Brachyury Ilia. 2b. 

 Kinky and fused mice. Mus musculus. E. CASPARI 

 Heteroploidy. 



J. Research in the general field of heteroploidy. This Illb. 4. 



includes surveys of frequency of polyploidy and 

 haploidy in natural populations of salamander larvae; 

 induction of heteroploidy by cold and heat; effects of 

 chemicals, etc., in production of abnormalities of mitosis 

 as the basis for induction of heteroploidy. Effect of 

 phenylthiourea on mitosis. Amblystoma punctatum. 



D. P. COSTELLO and Miss C. HENLEY 



J. Study of effects of triploidy on development of gonads. Ilia. 17. 

 Triturus viridescens. G. FANKHAUSER Illb. 17. 



J. Study of progeny of triploid, tetraploid and other hete- Illb. 4. 



roploid individuals among axolotls, Amblystoma mexi- 

 canum. G. FANKHAUSER and R. R. HUMPHREY 



J. Cytological study of polyploidizing effect of heat and Illb. 2a. d. 

 cold on fertilized eggs, and of parthenogenetic cleavage 

 induced by heat and cold treatment of unfertilized eggs. 

 Triturus viridescens. G. FANKHAUSER 



J. Experimental heteroploidy and parthenogenesis in Ilia. 4. 



newts. Heteroploid newt hybrids — developmental po- Illb. 4. 



tentialities and expression of species characters, sex Hid. 2. 



determination. Triton alpestris and T. palmatus. 



M. FISCHBERG 



J. Chromosomal mosaicism and abnormalities of mitosis 

 produced by experimental temperature shock on the 

 developing embryos of the California salamander, Tri- 

 turus torosus. C. HENLEY 



J. The offspring of polyploids; their chromosome number, II Id. 2. 



mortality, pathology, etc. Amblystoma (Siredon) mexi- 

 canum. R. R. HUMPHREY 



J. Studies on spontaneous haploidy and polyploidy. Am- Hid. 2. 

 blystoma (Siredon) mexicanum. R. R. HUMPHREY 



